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DxDiag ("DirectX Diagnostic Tool ") is a diagnostics tool used to test DirectX functionality and troubleshoot video or sound-related hardware problems. You can access the DirectX Diagnostic Utility (DXDiag) by typing dxdiag into Start Menu search box or Run dialog box and pressing Enter key.

The main tab of DXDiag, called System, displays basic information about your system such as your Processor (CPU) type and speed, amount of Memory (physical RAM) and the Pagefile (Virtual Memory) usage among other things. Under the Display, Sound and Input tabs you can find more information about the particular hardware you are running for each of these functions. Any problems found by DXDiag indicate that there may be an issue with your hardware or drivers.

The most useful function for DXDiag is its ability to generate a detailed text file with all your major system information, including your main hardware specifications, driver files, and environmental settings. To create this text file click the 'Save All Information' button found at the bottom of the main DXDiag screen. You will be prompted to save this report somewhere, and the default of the Windows Desktop is fine. You can now double-click this DXDiag.txt file to read through its contents. It can also be attached to an email you can send to a technical support person, or its contents can be copied and pasted onto an online forum to allow others to help you with any problems you may be experiencing. It doesn't contain any sensitive information such as serial numbers or passwords, so it is safe to post publicly.